JDBC 실습3 - update

• Role.java(DTO)는 JDBC 실습1 참고

프로젝트 실습

목표 : role 테이블의 description을 변경

1. RoleDao.java 코드작성

package kr.or.connect.jdbcexam.dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import kr.or.connect.jdbcexam.dto.Role;

public class RoleDao {
	private static String dburl = "jdbc:mysql://localhost:3306/connectdb?serverTimezone=UTC";
	private static String dbUser = "connectuser";
	private static String dbpasswd = "PASSWORD";
    
	public int updateRole(String old_description, String new_description) {
		int updateCount = 0;
		Connection conn = null;
		PreparedStatement ps = null;

		try {
			Class.forName("com.mysql.cj.jdbc.Driver");

			conn = DriverManager.getConnection(dburl, dbUser, dbpasswd);

			String sql = "UPDATE role SET description = ? WHERE description = ?";

			ps = conn.prepareStatement(sql);

			ps.setString(2, old_description);
			ps.setString(1, new_description);

			updateCount = ps.executeUpdate();

		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if (ps != null) {
				try {
					ps.close();
				} catch (Exception ex) {
				}
			} // if
			if (conn != null) {
				try {
					conn.close();
				} catch (Exception ex) {
				}
			} // if
		} // finally
		return updateCount;
	}
}

2. 실행코드작성

package kr.or.connect.jdbcexam;

import kr.or.connect.jdbcexam.dao.RoleDao;

public class JDBCExam3 {

	public static void main(String[] args) {
		RoleDao dao = new RoleDao();
		int updateCount = dao.updateRole("CTO", "CEO");
		System.out.println(updateCount);
	}
}

결과